Quantum Yield for Production of CH3 NC in the Photolysis of CH3 NCS

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The ultraviolet spectrum of methyl isothiocyanate (CH3 NCS) and the quantum yield for its dissociation into methyl isocyanide (CH3 NC) and atomic sulfur at 308 nanometers, Phi equals 0.98 plus minus 0.24, were measured. Methyl isothiocyanate is widely used as an agricultural fumigant and readily enters the atmosphere during and after application. The results indicate that photodissociation by sunlight is an effective pathway for its removal from the atmosphere.

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